820658057231 has 4 divisors (see below), whose sum is σ = 856338842352. Its totient is φ = 784977272112.

The previous prime is 820658057227. The next prime is 820658057281. The reversal of 820658057231 is 132750856028.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 820658057231 - 2² = 820658057227 is a prime.

It is a super-2 number, since 2×820658057231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820658057281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17840392526 + ... + 17840392571.

It is an arithmetic number, because the mean of its divisors is an integer number (214084710588).

Almost surely, 2^820658057231 is an apocalyptic number.

820658057231 is a deficient number, since it is larger than the sum of its proper divisors (35680785121).

820658057231 is a wasteful number, since it uses less digits than its factorization.

820658057231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35680785120.

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 820658057231 in words is "eight hundred twenty billion, six hundred fifty-eight million, fifty-seven thousand, two hundred thirty-one".